Anima App - Design, get feedback, convert to code, publish, iterate.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Timeline for Sketch - Create beautiful timeline animations in Sketch
draw.io - Online diagramming application
Monday Hero - Convert design into mobile code 😎
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.